Another inspiration of mine for Turbo is Mini 4WDs, they're a toy that's still very popular in Japan but had a very short run in the West during the late 80's. I remember collecting them but never had access to a track. Maybe that's why they never caught on in the States. Kids could buy the cars but couldn't race them because tracks were very rare. But from what I can see while playing Yakuza 0, is that Mini 4WD seem to have a deeper cultural impact in Japan.